121 results about "Fixed carbon" patented technology

The invention discloses an intelligent coal blending method and system for dual-engine staged solution in a power coal scene. The method comprises the following steps: performing structured processing on coal source data and establishing a hundred-ton integer batch variable; the method comprises the following steps of: constructing a hard constraint integer programming (ILP) model, and sequentially executing three stages of solving of cost minimization, heat value deviation minimization under the fixed cost and coal source quantity minimization under the fixed cost and deviation; when any stage is not feasible, automatically switching to a soft constraint target planning (GP) model, performing soft constraint on the coal quality index through a deviation variable, and sequentially performing deviation minimization, cost minimization and coal source quantity minimization; and calculating a combustion stability index (CSI) on the basis of volatile component fluctuation, fixed carbon, ash content change and sulfur content change, and carrying out stability verification on a final coal blending scheme. The system comprises a data management module, a first engine module, a second engine module, an automatic rollback module, a combustion stability index module and a result output module.

This invention discloses a spectral preprocessing method and related equipment for online coal quality detection using multispectral coupling. The method includes: simultaneously acquiring LIBS and NIRS spectra of raw coal using an online coal quality detection device; screening the effectiveness of the synchronized LIBS and NIRS spectra; identifying the defocusing amount of each set of synchronized LIBS and NIRS spectra and assigning a corresponding defocusing amount label to each set of spectra; correcting the defocused spectra according to the defocusing amount label using a spectral correction method to obtain corrected LIBS and NIRS spectra, and then fusing them to obtain a corrected fused spectrum; analyzing the LIBS spectrum, NIRS spectrum, and fused spectrum using quantitative analysis methods, and calculating the fixed carbon content. This invention's LIBS and NIRS spectral fusion overcomes the limitation of a single spectrum only characterizing atomic or molecular information, enabling a complete characterization of the chemical information of the coal sample and achieving simultaneous and accurate analysis of multiple coal quality indicators.

The invention discloses an artificial geothermal reservoir construction and development method based on oil shale reverse oxidation, and belongs to the technical field of resource exploitation, the method comprises the following steps: reservoir well construction: arranging an injection well, an exploitation well and a heat recovery well in a target layer section; an initial high-temperature environment is formed through manual heating, so that the oil shale is pyrolyzed to generate fixed carbon; injecting air to form an oxygen-enriched environment, initiating a fixed carbon oxidation self-heating reaction, and continuously pyrolyzing the oil shale; terrestrial heat is exploited through a circulating working medium, the air flow and components are dynamically controlled, and temperature control and safe operation are achieved; and finally reinjecting and sealing the carbon dioxide. The device can convert low-grade oil shale into clean geothermal energy, and has the advantages of energy conservation and environmental protection.

This invention relates to the field of iron and steel smelting technology, and proposes a method for improving the sintering uniformity of sintering mixtures. The method includes: preparing a first mixture for laying on the lower layer of a sintering machine trolley, and a second mixture for laying on the upper layer thereon, wherein the mass percentage of the first mixture is higher than that of the second mixture, the mass content of fixed carbon in the first mixture is lower than that in the second mixture, and the mass percentage of limestone in the flux used in the first mixture is higher than that in the second mixture; the first mixture is firstly distributed at the head of the sintering machine, and then the second mixture is secondly distributed at the head of the sintering machine; after the distribution is completed, sintering is performed by suction ignition. This invention improves the uniformity of strength and yield between the upper and lower layers of sintered ore, and increases sintering production efficiency.

The invention relates to the technical field of blast furnace ironmaking, in particular to an unfired pulverized coal generation quantity calculation method based on blast furnace operation parameters. The method specifically comprises the following steps: S1, acquiring a plurality of key operation parameters of the blast furnace; s2, inputting the plurality of key operation parameters into a pre-constructed unfired pulverized coal amount prediction model; the prediction model is a mathematical model reflecting a nonlinear relation between the key operation parameters and the unburned pulverized coal amount; s3, outputting a predicted value of the unburned pulverized coal amount of the blast furnace by the prediction model; wherein the plurality of key operation parameters at least comprise the temperature of blown hot air, the oxygen enrichment rate of the blown hot air, the strength after the thermal reaction of the charged coke, the grade of charged raw material iron, the fixed carbon content of the mixed pulverized coal, the volatile component content of the mixed pulverized coal, the fineness of the mixed pulverized coal and the coal injection quantity per ton of iron. Existing operation data can be fully utilized, and the quantity of unburned pulverized coal can be rapidly and accurately analyzed.

The present application relates to coal gangue treatment technical field, provide a kind of coal gangue-containing biofuel particle and its preparation method and application.The biofuel particle provided by the present application includes: coal gangue powder 60~62%;14~15% of oil-stained mixture;High molecular waste powder 24~26%;The oil-stained mixture is waste engine oil and / or oil-stained material;The oil-stained material is obtained by crushing and drying in turn from swill.The oil-stained mixture used in the present application is rich in oil and fat, with high volatile matter, easy to ignite, coal gangue and waste tires and / or waste plastic bottles have high fixed carbon content, long burning time, so that the biofuel particle of the present application has high calorific value, stable combustion, can be used as alternative fuel to alleviate the problem of traditional fossil fuel shortage.The present application uses catering leftovers swill, waste tires and / or waste plastic bottles and coal gangue powder, to prepare biofuel particles, which solves the various hazards caused by long-term storage of coal gangue.

The invention discloses a steel slag waste heat recovery device and process capable of synergistically fixing carbon, and relates to the field of steel slag pretreatment in the metallurgical industry, the steel slag waste heat recovery device comprises a hot-state steel slag receiving hopper, a hot-state steel slag chain scraper conveyor, a boiler bottom water tank, a boiler system, a cold-state steel slag bucket elevator conveyor, a carbon fixation reaction box body, a CO2 gas supply system and a cold slag conveying belt which are connected in sequence. According to the process, hot-state steel slag reacts with slag disintegrating water in a water tank at the bottom of a boiler to generate combustible gas, and the combustible gas combusts in a boiler system to heat circulating water to generate high-temperature and high-pressure steam to realize waste heat recovery; warm-state steel slag at 60-80 DEG C after slag disintegration and purified CO2-containing industrial waste gas are subjected to carbonation reaction in a carbon sequestration reaction box, the content of free calcium oxide and free magnesium oxide in the steel slag is reduced, and CO2 solid storage is achieved synchronously. The method is high in waste heat recovery efficiency, stable in steam output and remarkable in carbon sequestration effect, the resource utilization value of the steel slag is greatly improved, outstanding economic and environmental protection benefits are achieved, and iron and steel enterprises are assisted to achieve the dual-carbon target.

The invention provides rare earth tailing activated coal gangue as well as a preparation method and application thereof, and relates to the technical field of coal-based solid waste treatment. The invention provides a preparation method of rare earth tailing activated coal gangue, which comprises the following steps: mixing coal gangue powder and rare earth tailing powder, roasting and activating to obtain the rare earth tailing activated coal gangue; the rare earth tailing powder contains fluoride and chloride; the roasting activation temperature is less than or equal to 850 DEG C, and air is introduced in the roasting activation process. According to the method, fluorides, chlorides and rare earth elements in the rare earth tailings are utilized, activation energy is greatly reduced, energy consumption is reduced, coal gangue is utilized for fixing carbon, a large amount of heat energy is provided through combustion, and an aluminosilicate mineral phase structure with stable gas cracking is generated; stepped extraction is achieved, and no hazardous waste is generated. Moreover, the ore phase of the rare earth tailings and the ore phase of the coal gangue have high similarity, after catalytic activation, the grade of the final product is not affected, and high-grade minerals can be obtained.

This invention belongs to the field of quartz sandstone purification technology, specifically relating to a simple purification method for coal-based graphite, comprising the following steps: crushing low-grade coal-based graphite as raw material to obtain crushed coal-based graphite; mixing the crushed coal-based graphite with solid alkali and flux, followed by calcination and alkali fusion treatment to obtain calcined and alkali-fused coal-based graphite; acid leaching the calcined and alkali-fused coal-based graphite, followed by water washing, filtration, and drying to obtain high-grade coal-based graphite. Compared with existing graphite purification technologies, this invention does not require costly and hazardous reaction reagents or harsh conditions of high temperature and high pressure, and has advantages such as high graphite product purity, simple processing, convenient operation, mild conditions, environmental friendliness, and low cost. Using low-grade coal-based graphite with a fixed carbon content of 65%–85% as raw material, the process of this invention can obtain high-purity graphite with a fixed carbon content greater than 99.5%.

The utility model provides a biomass briquette fuel cooking stove suitable for a plateau area, and relates to the technical field of cookers. The cooking furnace comprises a furnace body, a fire grate and an air supply system. The furnace body comprises a primary combustion chamber and a secondary combustion chamber which are communicated with each other; the second-stage combustion chamber is relatively positioned above the first-stage combustion chamber; the first-stage combustion chamber is used for combusting fixed carbon in biomass briquette fuel, and the second-stage combustion chamber is used for combusting volatile components in the biomass briquette fuel. The fire grate is arranged in the first-stage combustion chamber and used for containing biomass briquette fuel. And the mounting height of the fire grate in the primary combustion chamber is adjustable. The air supply system communicates with the first-stage combustion chamber and the second-stage combustion chamber, the combustion efficiency is high, and the device is suitable for plateau areas with the low oxygen content in air.

A reducing agent for industrial silicon smelting and its preparation method are disclosed. The reducing agent raw materials include 80 wt.%–90 wt.% low-rank non-caking coal powder and 10 wt.%–20 wt.% biomass binder. In the preparation of the reducing agent, biomass and low-rank non-caking coal are separately ground into powder. The biomass powder is then subjected to alkali treatment and hydrothermal treatment to obtain the biomass binder. The biomass binder and the low-rank non-caking coal powder are mixed evenly. Simultaneously, during the mixing process, a solution of alkali metal or alkaline earth metal, water, and an inorganic binder solution are sequentially and uniformly sprayed onto the mixture. The materials are mixed evenly and agglomerated. Then, they are cold-pressed under a pressure of 10-15 MPa to obtain pellets. The pellets are then calcined at a temperature of 400-600℃ under anaerobic conditions for 10-30 hours, and cooled to room temperature in the furnace to obtain composite carbonaceous reducing agent pellets for industrial silicon smelting. The reactivity of the composite carbonaceous reducing agent pellets of this invention can reach more than 99% at 1000℃, with fixed carbon of not less than 75 wt.%, volatile matter of 12 wt.%-20 wt.%, moisture of less than 2 wt.%, and ash of less than 4 wt.%.

The invention relates to a method for preparing high-purity crystalline flake graphite through two-stage low-temperature roasting and water leaching. The method comprises the following steps: crushing natural crystalline flake graphite raw ore with the fixed carbon content of 60-95%, mixing the crushed natural crystalline flake graphite raw ore with composite alkali according to a mass ratio of graphite to total alkali of 1: (1.5-3), heating to 300-500 DEG C in an inert atmosphere, carrying out heat preservation for 1-4 h, carrying out furnace cooling, carrying out water immersion and solid-liquid separation at 40-90 DEG C in a solid-liquid ratio of 1: (20-100), and carrying out solid-liquid separation to obtain the crystalline flake graphite. The method comprises the following steps: mixing graphite with potassium pyrosulfate according to a mass ratio of graphite to potassium pyrosulfate of 1: (0.8-2.0), heating to 250-400 DEG C in an inert atmosphere, carrying out heat preservation for 1-3 hours, cooling, carrying out water immersion and solid-liquid separation, and drying to obtain a high-purity graphite product. The method is simple and controllable in process, high in adaptability to raw materials and convenient for industrial application.

The invention relates to the technical field of bituminous coal carbon content prediction, and discloses a bituminous coal coal quality industrial analysis-based unit calorific value carbon content prediction method, which comprises the following steps of 1, sampling a target coal type for industrial analysis, and detecting the total moisture Mt, the ash content Aar, the volatile component Var and the fixed carbon FCar content of the target coal type; measuring the calorific value of the sampled coal to obtain the lower calorific value Qnet, ar of the coal type; step 2, calculating a dry ash-free basis volatile component Vdaf and a lower calorific value Qnet, daf of the target coal type; 3, predicting the carbon content CQdaf of the dry ash-free basis unit calorific value of the target coal type; and step 4, calculating the unit calorific value carbon content CQar of the target coal type. According to the method, the unit calorific value carbon content of the bituminous coal can be accurately predicted, and coal purchase is guided; the coal carbon content is further calculated by using the unit calorific value carbon content calculated by the method, the prediction precision is very high, and the correlation coefficient can reach 1-10-10.

The present application provides a gasification slag extraction and recycling system and process to solve the problems of complex process, low recovery rate, high cost, and failure to achieve ideal utilization value, and inability to effectively improve the comprehensive utilization efficiency of gasification slag. The system includes a clean water pool, a gasification slag stirring pool, a first vibrating screen, a first sorting machine group, a second sorting machine group, and a second filter press; the discharge port of the gasification slag stirring pool is connected with the feed port of the first vibrating screen; the under-screen discharge port of the first vibrating screen is connected with the feed port of the first sorting machine group; the coarse concentrate discharge port of the first sorting machine group is connected with the feed port of the second sorting machine group; the concentrate discharge port of the second sorting machine group is connected with the second filter press. Glass crystals, tailing coarse particles, high-ash, fine tailings, fixed carbon, high-heat quality coal, and fine coal products are obtained by separating and extracting from the gasification slag using the system, which can be directly sold or recycled through a recycling production line.

In some variations, the present invention provides a biochar composition comprising: a low-fixed carbon material having a fixed carbon concentration of 20 wt% to 55 wt%; a high-fixed carbon material having a fixed carbon concentration of 50 wt% to 100 wt% (and higher than that of the low-fixed carbon material); 0 to 30 wt% moisture; 0 to 15 wt% ash; and 0 to 20 wt% of one or more additives (such as binders). Some variations provide a method for producing a biochar composition, the method comprising: pyrolyzing a first biomass-containing feedstock to produce a low-fixed carbon material; pyrolyzing a second biomass-containing feedstock separately to produce a high-fixed carbon material; blending the low-fixed carbon material with the high-fixed carbon material to produce an intermediate material; optionally blending one or more additives into the intermediate material; optionally drying the intermediate material; and recovering the biochar composition containing the intermediate material or a heat-treated form thereof.

The invention discloses a coal quality on-line detection system and a coal quality on-line detection method. The system comprises one or more sampling units, one or more gas-solid separation units, a plane powder feeding device, an NIRS measuring unit, a vertical powder feeding device and an LIBS measuring unit. The sampling unit extracts gas-solid two-phase pulverized coal flow from the pulverized coal pipeline; the gas-solid separation unit is used for separating; the plane pulverized coal feeding device forms a flattened pulverized coal surface for the NIRS measuring unit to collect a reflection spectrum; the vertical pulverized coal feeding device forms a vertical falling pulverized coal flow for the LIBS measuring unit to collect an excitation spectrum. According to the invention, in-situ, real-time and closed-loop detection of the pulverized coal flow as fired is realized, multi-index coal quality data such as moisture, ash content, volatile components, fixed carbon and element content are comprehensively and accurately obtained through dual-spectrum information fusion, and real-time data support is provided for combustion optimization and intelligent operation.

The invention discloses a carbonaceous composite forming reducing agent and a preparation method thereof, and belongs to the technical field of metallurgical reducing agents. The reducing agent is composed of the following components in parts by weight: 40-70 parts of fly ash generated in biomass pyrolysis and gasification processes, 20-50 parts of waste powdered activated carbon, 5-15 parts of waste activated carbon fiber and 0-20 parts of syrup, the fixed carbon content of the reducing agent is greater than or equal to 75%, the ash content is less than or equal to 5%, the compressive strength is greater than or equal to 8 MPa, the abrasive strength is greater than or equal to 90%, the reaction activity is greater than or equal to 96% (1000 DEG C), and the reducing agent can be used in the industrial silicon smelting industry. The method effectively solves the problems that fly ash generated in the biomass pyrolysis and gasification process is difficult to utilize, and an existing reducing agent for industrial silicon smelting is low in fixed carbon content, high in ash content, poor in strength and porosity and the like, the dependence of the reducing agent on traditional forest and fossil resources is greatly reduced, recycling of waste powdered activated carbon is achieved, and the production cost is reduced. The dual advantages of resource cyclic utilization, cost reduction and efficiency improvement are achieved.

The present application belongs to the technical field of geochemistry, and particularly relates to the estimation of the carbon flux of the earth system, and especially relates to a method and system for estimating the carbon flux of the deep-time earth system. The method for estimating the carbon flux of the deep-time earth system provided by the present application solves the four defects in the traditional technology caused by the fixed carbon pool assumption, the neglect of the atmospheric / biosphere carbon content, the isotopic error, and the failure to consider the fractionation effect through dynamic carbon pool segmentation, the inclusion of multi-sphere isotopic composition, and the correction of fractionation effect. The high-precision and verifiable model framework not only improves the scientificity of the deep-time carbon cycle research, but also provides a key tool for analyzing the climate evolution mechanism in the geological history period and predicting the future climate change trend, and has important theoretical innovation and practical application value.

[Problem] To provide a fixed carbon source capable of more efficiently producing an organic substance, and to provide a metal carbide and a method for producing the metal carbide. [Solution] One aspect of the present invention provides a fixed carbon source comprising a combustion residue of waste, the fixed carbon source containing silicon atoms and carbon atoms derived from the combustion residue of the waste, and the content of the silicon atoms being 10 mass% or less.

The invention discloses a garbage layer thickness mathematical model suitable for a grate type garbage incinerator, and relates to the technical field of grate type garbage incinerators, which comprises the following steps: based on a garbage image and near infrared spectrum data collected by a feeding end, identifying garbage components and determining volatile component mass fraction, fixed carbon proportion and moisture content; determining an Arrhenius parameter and an effective heat conductivity coefficient in the combustion reaction; dividing the fire grate into a plurality of control bodies along the length direction, and establishing a mass conservation differential equation for describing the dynamic change of the thickness of the garbage layer for each control body by combining the Arrhenius parameters and the effective heat conductivity coefficients; performing numerical solution on the mass conservation differential equation to obtain a predicted value of the garbage layer thickness of each control body evolving along with time, and forming a layer thickness distribution prediction result along the fire grate direction; judging a combustion stage according to the temperature and moisture state of each control body, and setting a temperature threshold value and a moisture content threshold value when the temperature exceeds a preset threshold value and the moisture content is lower than the preset threshold value.

To provide a carbonaceous material for an electric furnace capable of accelerating foaming of slag when refining a molten metal using an electric furnace and a manufacturing method of a carbonaceous material for an electric furnace.SOLUTION: A carbonaceous material for an electric furnace has a composition of a fixed carbon content 50 mass% or more, a volatile component 40 mass% or less, a sulfur content 0.5 mass% or less with a balance ash content in a dry state excluding a water content, and separately the water content is 8.4 to 15 mass%, inclusive, based on the mass in the dry state excluding the water content. More preferably, a median particle diameter of the carbonaceous material for an electric furnace is 5 mm or less. Further preferably, the carbonaceous material for an electric furnace includes biomass charcoal obtained by carbonizing biomass.SELECTED DRAWING: None

According to the solid waste pyrolysis and melting integrated treatment system, the pyrolysis carbonization furnace, the melting furnace and the secondary combustion chamber are combined together and arranged from top to bottom, and the occupied area of the system is reduced; the air guiding and material scraping structure is arranged at the bottom of the pyrolysis carbonization furnace, pyrolyzed carbide generated after pyrolysis reaction in the pyrolysis carbonization furnace is crushed through the air guiding and material scraping structure to obtain pyrolysis slag, other treatment equipment does not need to be additionally arranged, and the pyrolysis slag is directly fed into the melting furnace to be further heated and melted in a hot state without being cooled; the material treatment process is shortened, hot slag is directly melted, waste of waste heat of the slag is avoided, high-temperature hot slag is fed into the melting furnace, less heat is needed for heating the hot slag to the melting temperature in the melting furnace, fixed carbon generated by pyrolysis in the hot slag can be used as a fuel source, and therefore less fuel is needed for melting, and the energy consumption is reduced. Therefore, the construction and operation cost of the heat treatment system is greatly reduced.

This invention discloses an organic polluted soil remediation system and process based on ex-situ SVE (Self-Volatilization and Ventilation). The system includes a centrifugal compression component, a heating component, a rotary airlift component, a cyclone separator component, a fixed bed component, and a ventilation component arranged in a closed loop and connected in sequence. This system facilitates the circulation and full utilization of heat and oxygen, and allows for the thorough catalytic purification of organic waste gas. The centrifugal compression component and the heating component pressurize and heat the air drawn in from the outside and guide it to the bottom of the rotary airlift component. The rotary airlift component carries away organic pollutants from the polluted soil using high-temperature and high-pressure air, thereby purifying the soil. The cyclone separator removes dust from the air discharged from the rotary airlift component. The fixed bed component purifies organic pollutants and fixes carbon. After multiple cycles, when the concentration of VOCs and SVOCs in the purified gas is less than 50 mg / kg, the purified gas that meets the emission standards can be discharged.

The invention provides a method for preparing mesoporous carbon with a high specific surface area. The method comprises the following steps: (1) mixing, grinding and scattering silicon carbon ore, water and a grinding aid, and then performing nanocrystallization grinding in a bead mill until D90lt; the silicon carbon ore comprises micro-nano SiO2 and fixed carbon, the fixed carbon is porous, the specific surface area of the fixed carbon is 13-17 m < 2 > / g, the porosity of the fixed carbon is 30%-45%, the aperture of the fixed carbon is 15-25 nm, the pore volume of the fixed carbon is 0.10-0.18 cm / g, and the D90 of SiO2 is smaller than 5 microns; (2) extracting the nanoscale silicon carbon ore slurry by using an extracting agent; (3) purifying the primary carbon powder to obtain high-purity carbon powder; (4) performing first calcination on the high-purity carbon powder and a first activating agent to obtain first carbon powder; (5) carrying out second calcination on the first carbon powder and a second activating agent to obtain second carbon powder; and (6) purifying and drying the second carbon powder to obtain the mesoporous carbon. According to the invention, natural nano silicon carbon ore is used as a carbon source to prepare the active carbon material with high specific surface area and well-developed pore distribution.

compacted 'green' briquettes between 5 cm 3 and 20 cm 3 in size comprising a composition comprising at least 30% lignocellulosic biomass material by dry weight and at least 55% iron ore fines by weight, a density between 1.4 g / cm 3 and 2.0 g / cm 3 and a compacted strength of at least 500 N. Direct reduced iron briquettes suitable for producing iron and / or steel comprise at least 85% iron by weight and at least 1% fixed carbon by weight and a volume between 7.5 cm 3 and 30 cm 3 in size, wherein said briquettes have the above composition prior to reduction (i.e. as 'green' briquettes).

This application discloses a coal-based carbon raiser with high fixed carbon content and its preparation method. The carbon raiser is prepared from raw materials comprising at least coal-based powder, biomass tar, and pitch through a mixing, granulation, graphitization, and calcination process, wherein the mass ratio of the coal-based powder, biomass tar, and pitch is 100:20–40:10–20. The carbon raiser of this application exhibits outstanding fixed carbon content, excellent mechanical strength, and high carbon raising efficiency.

The invention provides a method for preparing high-purity nano spherical silica powder, which comprises the following steps: (1) silicon carbon ore is calcined to obtain a decarbonized sample, the silicon carbon ore comprises micro-nano SiO2 and fixed carbon, the fixed carbon is porous, the specific surface area of the fixed carbon is 13-17m < 2 > / g, the porosity of the fixed carbon is 30-45%, the aperture of the fixed carbon is 15-25nm, and the diameter of the fixed carbon is 10-15nm; the pore volume is 0.10-0.18 cm / g, and the D90 of SiO2 is less than 5 microns; (2) adding water into the carbon-removed sample to prepare slurry, carrying out ultrafine grinding, carrying out acid leaching, carrying out suction filtration, pickling and drying to obtain a primary sample; and (3) adding water into the primary sample to obtain slurry, carrying out nanometer grinding on the slurry, filtering, and drying to obtain the silica powder. According to the method, the silicon carbon ore with a specific structure is innovatively selected, the silicon carbon ore can be ground to the nanoscale by a simple physical method, and purification and nanofiltration methods are cooperatively used, so that the high-purity spherical nano silicon micropowder is successfully prepared.

The invention relates to an injection coal proportioning and utilization technology in the field of blast furnace ironmaking, and discloses injection coal and a coal blending method thereof. According to the method, the fixed carbon mass fraction of mixed pulverized coal is not lower than 74%, the sulfur mass fraction is not higher than 0.75%, and the dry basis high calorific value is not lower than 7600 kcal / kg as control indexes, high-sulfur injection coal, large bituminous coal and high-carbon fly ash are selected to prepare the pulverized coal, and matching is conducted within the range that the high-carbon fly ash mass fraction ranges from 1% to 2%, and the large bituminous coal mass fraction ranges from 11% to 18%. And the carbon content and the fineness of the high-carbon fly ash are controlled, so that the obtained mixed pulverized coal meets the requirements of blast furnace injection granularity and components. Compared with the prior art, the method has the advantages that the pulverized coal injection cost is reduced on the premise of ensuring smooth operation of the blast furnace and stable sulfur content of the molten iron, and stable resource utilization of the high-carbon fly ash is realized.

The application provides a method for purifying graphite by using a gradient plasma and high-purity low-damage graphite powder. The method comprises the following steps: performing first gradient plasma treatment on graphite raw materials to obtain a first intermediate product; performing second gradient plasma treatment on the first intermediate product in a first mixed gas with an oxygen-containing gas content of less than or equal to 5 vol% to obtain a second intermediate product; performing third gradient plasma treatment on the second intermediate product in a second mixed gas with a fluorocarbon gas content of less than or equal to 1.5 vol% to obtain a third intermediate product; performing fourth gradient plasma treatment on the third intermediate product in a third mixed gas with a reducing gas content of greater than or equal to 1 vol% to obtain a fourth intermediate product; and performing washing on the fourth intermediate product to obtain high-purity low-damage graphite powder. The high-purity low-damage graphite powder obtained by the method has a high fixed carbon content and fewer defects in the graphite structure.

To provide a method for fixing carbon dioxide in a management type disposal site capable of efficiently reducing carbon dioxide in the atmosphere toward carbon neutral as much as possible according to reclamation work when coal ash from a coal thermal power plant is reclaimed.SOLUTION: Wet ash or coal ash slurry is reclaimed in a land portion of a management type disposal site, and a surface in contact with the atmosphere is created in the reclaimed ground, and curing is performed, whereby carbon dioxide can be stored and fixed in the reclaimed ground of coal ash. As a result, carbon dioxide in the atmosphere can be efficiently reduced as much as possible toward carbon neutral according to reclamation work.SELECTED DRAWING: Figure 1